Copyright (c) 1997 Joerg Wunsch
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$FreeBSD: head/lib/libc/stdtime/strptime.3 79754 2001-07-15 07:53:42Z dd $
"
.Dd May 8, 1997 .Dt STRPTIME 3 .Os .Sh NAME .Nm strptime .Nd parse date and time string .Sh LIBRARY .Lb libc .Sh SYNOPSIS .Fd #include <time.h> .Ft char * .Fn strptime "const char *buf" "const char *format" "struct tm *timeptr" .Sh DESCRIPTION The .Fn strptime function parses the string in the buffer .Fa buf according to the string pointed to by .Fa format , and fills in the elements of the structure pointed to by .Fa timeptr . The resulting values will be relative to the local time zone. Thus, it can be considered the reverse operation of .Xr strftime 3 .
p The .Fa format string consists of zero or more conversion specifications and ordinary characters. All ordinary characters are matched exactly with the buffer, where white space in the format string will match any amount of white space in the buffer. All conversion specifications are identical to those described in .Xr strftime 3 .
p Two-digit year values, including formats .Fa %y and .Fa %D , are now interpreted as beginning at 1969 per POSIX requirements. Years 69-00 are interpreted in the 20th century (1969-2000), years 01-68 in the 21st century (2001-2068). .Sh RETURN VALUES Upon successful completion, .Fn strptime returns the pointer to the first character in .Fa buf that has not been required to satisfy the specified conversions in .Fa format . It returns .Dv NULL if one of the conversions failed. .Sh SEE ALSO .Xr date 1 , .Xr scanf 3 , .Xr strftime 3 .Sh AUTHORS The .Fn strptime function has been contributed by Powerdog Industries.
p This man page was written by .An J\(:org Wunsch . .Sh HISTORY The .Fn strptime function appeared in .Fx 3.0 . .Sh BUGS Both the .Fa %e and .Fa %l format specifiers may incorrectly scan one too many digits if the intended values comprise only a single digit and that digit is followed immediately by another digit. Both specifiers accept zero-padded values, even though they are both defined as taking unpadded values.
p The .Fa %p format specifier has no effect unless it is parsed .Em after hour-related specifiers. Specifying .Fa %l without .Fa %p will produce undefined results. Note that 12AM
q ante meridiem is taken as midnight and 12PM
q post meridiem is taken as noon.
p The .Fa %U and .Fa %W format specifiers accept any value within the range 00 to 53 without validating against other values supplied (like month or day of the year, for example).
p The .Fa %Z format specifier only accepts time zone abbreviations of the local time zone, or the value "GMT". This limitation is because of ambiguity due to of the over loading of time zone abbreviations. One such example is .Fa EST which is both Eastern Standard Time and Eastern Australia Summer Time.